Using a real-time renormalization-group method we determine the complete dynamics of the spin-boson model with Ohmic dissipation for coupling strengths α0.1--0.2. We calculate the relaxation and dephasing time, static susceptibility, and correlation functions. Our results are consistent with quantum Monte Carlo simulations and the Shiba relation. We present reliable results for finite cutoff and finite bias in a regime where perturbation theory in α or in tunneling breaks down. Furthermore, an unambiguous comparison to results from the Kondo model is achieved.
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Keil et al. (2001) studied this question.
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